That's exactly what I would like to know. My pool is also rectangular 14'x28' and I can't never figured out what's the best angle to aim the three return jets. Sorry if I don't have the answer for you but I hope we will get one . Thank you.

Either CW or CCW rotation, to shoot new clean water along side the wall sligtly upward to clearly see the ripple. That way you move the top water to the skimmers faster to pick up floating debris. Also, bottom drain then picks up mostly dirty water to filter, not partialy cleaned water. Another benefit is imposing slightly less restriction on return, lowering the backpressure and warming up the bottom water. I usually deploy only one skimmer to increase suction on the main drain to maximize the flushing effect in the pool. It worked the best for me for the last 30 years.